How to compare filesystem contents

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Hello All,

 I was moving my filesystem to a new disk with 'cp -ax' command (as
 root). It completed with no error messages, but I can see some
 difference between the old and the new filesystems when using df:

# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/vg_mythbackend-wd20eads
                     1922859824 1791862788  33321364  99% /newdisk
/dev/mapper/VolTerabytes00-Data00
                     1922868016 1793705984  51021168  98% /olddisk


My new filesystem uses ext4, while old one was using ext3 - can that
be somehow related?. I fact, I don't see how it can affect the used
space reported, since block size is 4K for both...
                     
I'm pretty sure I stopped most of the processes, so there was none that
could write to original filesystem while files were copied. Well,
maybe I missed something...

Is there an easy way to check which files are there on the old
filesystem, that do not exist on the new one?

Thanks!
                     
-- 
Best regards,
 Andrew                    

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